Which of the following is an example of governance for an insider threat program?

Implementing banners notifying users that their activity is being monitored is a clear example of governance within an insider threat program because it establishes transparency and sets expectations regarding user behavior. This practice enforces policies related to data protection and security by ensuring that employees are aware that their actions may be observed. This proactive measure can deter potential insider threats by reminding users of their responsibility to adhere to regulations and guidelines.

In contrast, the other options do not directly pertain to governance mechanisms designed to mitigate insider threats. Reducing employee work hours could impact productivity and morale without addressing the threat directly. Creating more paperwork might complicate compliance but doesn't provide clear oversight or governance. Restructuring departmental hierarchies might improve operational efficiency but does not inherently relate to monitoring or managing insider threats. Hence, option B distinctly embodies the principles of governance within the context of an insider threat program.